"""Webapp views."""

from django.db.models import Count
from django.shortcuts import render, redirect
from django.contrib.auth import login, logout, authenticate
from django.views.decorators.http import require_http_methods
from django.views.decorators.csrf import ensure_csrf_cookie
from django.http import HttpResponse, HttpResponseRedirect
from django.contrib.auth.decorators import permission_required, login_required
from django.conf import settings

import logging
import requests

from webapp.models import PresetKaehmyRole, CustomKaehmyRole
from webapp.models import OhlhafvChallenge, KaehmyForm, TelegramChannel
from webapp.forms import OhlhafvForm, KaehmyForm_Form, KaehmyCommentForm
from webapp.tables import OhlhafvTable

from django.core.mail import send_mail


def send_email(to, subject, body):
    success = send_mail(
        subject,
        body,
        settings.DEFAULT_EMAIL_FROM,
        [to],
        fail_silently=False,
    )

    if success == 0:
        raise Exception('Failed to send email!')


@require_http_methods(["GET"])
def main_index(request, *args, **kwargs):
    """Render main page."""
    return render(request, "main_index.html", {})


@require_http_methods(["GET", "POST"])
@ensure_csrf_cookie
@login_required(login_url='/login')
@permission_required('members.change_member')
def admin_index(request, *args, **kwargs):
    """Render admin main page."""
    return render(request, "admin_index.html", {})


@require_http_methods(["GET", "POST"])
def login_view(request, *args, **kwargs):
    """Render login view."""
    if request.method == "POST":
        uname = request.POST.get("username", None)
        pw = request.POST.get("passwd", None)
        user = authenticate(username=uname, password=pw)
        if user is not None:
            login(request, user)
            original_site = request.GET.get("next", None) or "/"
            return redirect(original_site)
        return render(request,
                      "login.html",
                      {"error": "☹ Kirjautuminen kosahti. Yritä uudelleen!"})

    # user got here by a get request
    user = request.user
    if user.is_authenticated():
        # user shoud not be here authenticated with get but get rid if is
        return redirect("/")
    return render(request, "login.html", {})


@require_http_methods(["GET", "POST"])
def logout_view(request, *args, **kwargs):
    """Logout user and return to main page."""
    logout(request)
    return redirect("/")


@require_http_methods(["GET"])
def about_view(request, *args, **kwargs):
    """Render about page."""
    return render(request, "about.html", {})


@require_http_methods(["GET"])
def guild_view(request, *args, **kwargs):
    """Render "Guild" page."""
    return render(request, "guild.html", {})


@require_http_methods(["GET"])
def freshmen_view(request, *args, **kwargs):
    """Render "Freshmen" page."""
    return render(request, "freshmen.html", {})


@require_http_methods(["GET"])
def jobs_view(request, *args, **kwargs):
    """Render "Jobs" page."""
    return render(request, "jobs.html", {})


@require_http_methods(["GET"])
def event_calendar_view(request, *args, **kwargs):
    """Render "Event calendar" page."""
    return render(request, "event_calendar.html", {})


@require_http_methods(["GET"])
def international_view(request, *args, **kwargs):
    """Render "International" page."""
    return render(request, "international.html", {})


@require_http_methods(["GET"])
def sosso_view(request, *args, **kwargs):
    """Render "Sössö" page."""
    return render(request, "sosso.html", {})


@require_http_methods(["GET"])
def contact_view(request, *args, **kwargs):
    """Render "Contact" page."""
    return render(request, "contact.html", {})


@require_http_methods(["GET"])
def kaehmy_view(request, *args, **kwargs):
    """Render Kaehmy form page."""
    form = KaehmyForm_Form()
    return render(request, 'kaehmy.html', {'form': form})


@ensure_csrf_cookie
@require_http_methods(["POST"])
def kaehmy_submit(request, *args, **kwargs):
    """Submit Kaehmy form."""
    form = KaehmyForm_Form(request.POST)
    if form.is_valid():
        application = form.save()
        custom_name = form.cleaned_data.get('custom_role_name')
        custom_is_board = form.cleaned_data.get('custom_role_is_board')

        if len(custom_name) > 0:
            custom_role = CustomKaehmyRole(
                name=custom_name, is_board=custom_is_board)
            custom_role.save()
            application.custom_roles.add(custom_role)

        url = 'https://sika.sahkoinsinoorikilta.fi/kaehmy'

        email = form.cleaned_data.get('email', '')
        name = form.cleaned_data.get('name', 'Anonymous')
        subject = 'Arwokas kirjattu kirje mahdolliselle tulewalle kiltahenkilölle'
        body = ('Moikka {}!\r\n\r\nHienoa, että kilta kiinnostaa! Kaehmysi on vastaanotettu.\r\n'
                'Mahdollisista kommenteista tulee ilmoitus sähköpostitse.\r\n\r\n'
                'Käy katsomassa kaehmytilanne osoitteessa {}').format(name, url)

        send_email(email, subject, body)
        logging.debug('Sent kaehmy email to recipient <{}>'.format(email))

        CHAT_IDS = [channel.channel_id for channel in TelegramChannel.objects.all()]
        for chat_id in CHAT_IDS:
            tg_string = 'https://api.telegram.org/bot{}/sendMessage?chat_id={}&text={}'.format(
                settings.TELEGRAM_BOT_TOKEN,
                chat_id,
                'Uusi kaehmy/New kaehmy! {} -> {}'.format(name, url)
            )
            response = requests.get(tg_string).json()
            logging.debug('Telegram API response:\n{}'.format(response))
        logging.debug('Sent kaehmy announcement to {} channels.'.format(len(CHAT_IDS)))

    else:
        context = {
            'errors': form.errors
        }
        return render(request, 'error.html', context)
    return HttpResponseRedirect('/kaehmy')


@require_http_methods(["GET"])
def ohlhafv_view(request, *args, **kwargs):
    """Render Ohlhafv form page."""
    form = OhlhafvForm()
    return render(request, 'ohlhafv.html', {'form': form})


@ensure_csrf_cookie
@require_http_methods(["POST"])
def ohlhafv_submit(request, *args, **kwargs):
    """Submit Ohlhafv form."""
    form = OhlhafvForm(request.POST)
    if form.is_valid():
        form.save()
        # return HttpResponseRedirect('/list/')
    else:
        pass
        # return render(request, 'error.html', {'error': form.errors})
    return HttpResponseRedirect('/ohlhafv/list/')


@ensure_csrf_cookie
@require_http_methods(["GET"])
def ohlhafv_list(request, *args, **kwargs):
    """Present Ohlhafv challenges list."""
    challenges = OhlhafvChallenge.objects.all()

    table = OhlhafvTable(challenges,
                         request=request,
                         exclude=['id', 'challenger_email', 'victim_email'],
                         attrs={'class': 'table table-bordered table-hover'})

    table.paginate(page=request.GET.get('page', 1), per_page=25)
    table_html = table.as_html(request)

    context = {
        'table': table_html,
        'challenge_count': len(challenges),
    }
    return render(request, 'ohlhafv_list.html', context)


@ensure_csrf_cookie
@require_http_methods(["GET"])
def kaehmy_list_view(request, *args, **kwargs):
    """Kaehmy application list"""

    role_filter = request.GET.get('role', None)
    if role_filter is not None and str(role_filter) != '-1':
        applications = KaehmyForm.objects.filter(custom_roles__id=role_filter) | KaehmyForm.objects.filter(preset_roles__id=role_filter)
    else:
        applications = KaehmyForm.objects.all()

    applications = applications.order_by('-timestamp')
    filter_options_preset = PresetKaehmyRole.objects.annotate(form_count=Count('forms')).filter(form_count__gt=0)
    filter_options_preset_list = [(r.id, r.name, r.form_count) for r in filter_options_preset]
    filter_options_custom = CustomKaehmyRole.objects.annotate(form_count=Count('forms')).filter(form_count__gt=0)
    filter_options_custom_list = [(r.id, r.name, r.form_count) for r in filter_options_custom]

    filter_options = filter_options_preset_list + filter_options_custom_list
    filter_options.sort(key=lambda f: f[1])

    context = {
        'applications': applications,
        'application_count': len(applications),
        'filter_options': filter_options
    }
    return render(request, 'kaehmy_list.html', context)


@ensure_csrf_cookie
@require_http_methods(["POST"])
def kaehmy_comment(request, *args, **kwargs):
    """POST endpoint for commenting"""

    form = KaehmyCommentForm(request.POST)
    if form.is_valid():
        comment = form.save()
        email = comment.parent.email
        name = comment.name

        subject = 'Kaehmyysi tai kommenttiisi on vastattu!'
        body = ('{} on vastannut kaehmyhakemukseesi tai kommenttiisi kaehmypalvelussa.\r\n\r\n'
                'Käy lukemassa viesti osoitteessa http://sika.sahkoinsinoorikilta.fi/kaehmy').format(name.capitalize())

        send_email(email, subject, body)
        logging.debug(
            'Sent kaehmy comment email to recipient <{}>'.format(email))

        return redirect('/kaehmy')
    else:
        print(form)
        context = {
            'errors': form.errors
        }
        return render(request, 'error.html', context)


@require_http_methods(["GET"])
def kaehmy_statistics_view(request, *args, **kwargs):
    """Kaehmys roles listed by applications"""

    applications = KaehmyForm.objects.all()
    role_list = []

    preset_roles = PresetKaehmyRole.objects.all()
    custom_roles = CustomKaehmyRole.objects.all()

    for preset in preset_roles:
        people = [form.name for form in preset.forms.all()]
        role_list.append((preset.name, len(people), ', '.join(people)))
    for custom in custom_roles:
        people = [form.name for form in custom.forms.all()]
        role_list.append((custom.name, len(people), ', '.join(people)))

    context = {
        'applications': applications,
        'application_count': len(applications),
        'role_list': role_list
    }
    return render(request, 'kaehmy_statistics.html', context)